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A CMOS time-domain smart temperature sensor with one homogeneous delay line and curvature compensation is presented for accuracy improvement. For temperature sensing, a temperature-sensing delay line was used to generate a thermal pulse with a width (tp) proportional to absolute temperature. However, a curvature exists on the temperature-to-time transfer curve of the delay line to seriously affect...
This paper proposes a CMOS oscillators-based smart temperature sensor with a SAR (Successive Approximation Register) search algorithm. To reduce the cost and release the number of bits, a temperature-dependent delay circuit (TDDC) composed of a thermal ring oscillator and a fixed-gain time amplifier was used to generate a thermal sensing delay proportional to the test temperature. An adjustable reference...
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